Lead Management Script

I need an affiliate network script with the following modifications: 1) It needs to based only on lead generation, NOT per sale, click, etc. 2) The system needs to accept leads that are fed into the system via an email and via standard form. 3) It needs to allow both merchants and affiliates to signup. 4) It needs to accept payment from merchants. 5) Only allow the number of leads that the merchant has paid for. 6) Be based on a fixed price per lead.